xen/riscv: introduce (de)initialization helpers for vINTC

Add common helpers domain_vintc_init() and domain_vintc_deinit() to
allocate and deallocate a virtual interrupt controller (vINTC)
structure and initialize basic virtual interrupt controller registers.

domain_vintc_deinit() isn't called at the moment as arch_domain_destroy()
is implemented as stub at the moment.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/riscv/domain.c

@@ -291,7 +291,9 @@ int arch_sanitise_domain_config(struct xen_domctl_createdomain *config)
 
 void arch_domain_destroy(struct domain *d)
 {
-    printk(XENLOG_WARNING "%s: unimplemented\n", __func__);
+    printk(XENLOG_WARNING "%s: not fully implemented\n", __func__);
+
+    domain_vintc_deinit(d);
 }
 
 int arch_domain_create(struct domain *d,
@@ -308,6 +310,9 @@ int arch_domain_create(struct domain *d,
     if ( (rc = p2m_init(d, config)) != 0)
         goto fail;
 
+    if ( (rc = domain_vintc_init(d)) )
+        goto fail;
+
     return rc;
 
  fail:

xen/arch/riscv/include/asm/intc.h

@@ -79,4 +79,7 @@ void intc_route_irq_to_xen(struct irq_desc *desc, unsigned int priority);
 
 void intc_handle_external_irqs(struct cpu_user_regs *regs);
 
+int domain_vintc_init(struct domain *d);
+void domain_vintc_deinit(struct domain *d);
+
 #endif /* ASM__RISCV__INTERRUPT_CONTOLLER_H */

xen/arch/riscv/intc.c

@@ -11,6 +11,7 @@
 
 #include <asm/aia.h>
 #include <asm/intc.h>
+#include <asm/vaplic.h>
 
 static const struct intc_hw_operations *__ro_after_init intc_hw_ops;
 
@@ -83,3 +84,37 @@ int __init make_intc_domU_node(struct kernel_info *kinfo)
 
     return vintc->init_ops->make_domu_dt_node(kinfo);
 }
+
+int domain_vintc_init(struct domain *d)
+{
+    int ret = -EOPNOTSUPP;
+    const enum intc_variant variant = intc_hw_ops->info->hw_variant;
+
+    switch ( variant )
+    {
+    case INTC_APLIC:
+        ret = domain_vaplic_init(d);
+        break;
+
+    default:
+        printk_once("vintc (variant:%d) isn't implemented\n", variant);
+        break;
+    }
+
+    return ret;
+}
+
+void domain_vintc_deinit(struct domain *d)
+{
+    const enum intc_variant variant = intc_hw_ops->info->hw_variant;
+
+    switch ( variant )
+    {
+    case INTC_APLIC:
+        domain_vaplic_deinit(d);
+        break;
+
+    default:
+        break;
+    }
+}